“…Recently, another type of two-dimensional carbon allotrope, called the biphenylene network (BPN), was synthesized and has attracted significant interests in various properties of BPN layers including electronic, optical, mechanical, thermal, magnetic, and chemical properties. − Moreover, from the first-principles analysis, BPN turned out to exhibit another intriguing band dispersion called type-II Dirac fermion consisting of two heavily inclined cones, so that we have open Fermi surfaces instead of Fermi points or circles. , In type-II Dirac semimetals, one can have electron- and hole-type carriers simultaneously in contrast to the type-I case such as graphene. This intricate band shape may lead to a variety of unusual electronic phenomena such as anisotropic transport and magnetoresistance behavior − and undamped gapless plasmon modes .…”